Features 1、[HEAT DISSIPATION] The LM317 adjustable regulated power supply board has heatsinks, the special shape has good heat dissipation effect. 2、[POTENTIOMETER] Equipped with duplex adjusting potentiometer, which is convenient to adjust the voltage. 3、[VOLTAGE RANGE] The voltage input range is DC 0‑30V or AC 0‑30V, and the output voltage is 1.25V‑28V continuously adjustable. 4、[DIGITAL DISPLAY] Added the digital display voltage function, easy to check, very suitable for voltage experiment. 5、[MULTIPLE USAGES] The voltage reducer board is compact, easy to install, and can be used for various power equipment. Specification Item Type: Voltage Regulator Module Product Model: LM317 Voltage Input Range: DC 0-30V, AC 0-30V Load: 2A or less Output Voltage: 1.25V-28V continuously adjustable Circuit Board Size: Approx. 68 x 51mm / 2.7 x 2in Package List 1 x Voltage Regulator Module